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Arabidopsis AtNAP regulates fruit senescence

机译：拟南芥AtNAP调节果实衰老

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Arabidopsis has been used as a model system to study many aspects of plant growth and development. However, fruit senescence in Arabidopsis has been less investigated and the underlying molecular and hormonal (especially ethylene) regulatory mechanisms are not well understood. It is reported here that the Arabidopsis silique has characteristics of a climacteric fruit, and that AtNAP, a NAC family transcription factor gene whose expression is increased with the progression of silique senescence, plays an important role in its senescence. Silique senescence was delayed for 4–5 d in the atnap knockout mutant plants. The ethylene climacteric was delayed for 2 d in the atnap silique and the associated respiratory climacteric was suppressed. Exogenous ethylene stimulated respiration in the wild type, but not in the atnap mutant. The decoupling of the ethylene and respiratory climacterics in the atnap mutant suggests that AtNAP is required for ethylene stimulation of respiration. qPCR analyses revealed that the expression patterns of genes involved in ethylene biosynthesis, perception, and signalling, ACS2, ETR1, CTR1, EIN2, EIN3, and ERF1, were also altered in the atnap mutant. The effects of exogenous ABA, SA, 6-BA, and NAA on ethylene production and respiration in siliques of the wild type and atnap mutant were also investigated. A model involving ABA-AtNAP-controlled stomatal opening in regulating ethylene-stimulated respiration in fruit senescence is presented.
机译：拟南芥已被用作模型系统来研究植物生长和发育的许多方面。然而，对拟南芥果实衰老的研究较少，对潜在的分子和激素（尤其是乙烯）调节机制的了解还很少。据报道，拟南芥具有更年期果实的特征，AtNAP是一种NAC家族转录因子基因，其表达随角果衰老的进程而增加，在其衰老中起重要作用。在atnap基因敲除突变体植物中，Silique衰老被延迟了4-5 d。在atnap角果树上，乙烯更年期推迟了2天，相关的呼吸更年期得到了抑制。外源乙烯刺激了野生型的呼吸作用，但atnap突变体却没有。在atnap突变体中，乙烯与呼吸更年期的分离表明，AtNAP是乙烯刺激呼吸所必需的。 qPCR分析表明，参与atnap突变体的乙烯生物合成，感知和信号传递，ACS2，ETR1，CTR1，EIN2，EIN3和ERF1的基因表达模式也发生了变化。还研究了外源ABA，SA，6-BA和NAA对野生型和atnap突变体的果皮中乙烯产生和呼吸的影响。提出了一个模型，该模型涉及ABA-AtNAP控制的气孔开口，用于调节果实衰老中乙烯刺激的呼吸。

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